export uptime

Summary: This will help us to estimate health of the device fleet

Differential Revision: D67601592

calnex/api/api.go

@@ -82,6 +82,11 @@ type Version struct {
 	Firmware string
 }
 
+// Uptime is a struct representing Calnex uptime JSON response
+type Uptime struct {
+	Uptime int64
+}
+
 // GNSS is a struct representing Calnex GNSS JSON response
 type GNSS struct {
 	AntennaStatus         string
@@ -461,6 +466,7 @@ const (
 	rebootURL      = "https://%s/api/reboot?action=reboot"
 
 	versionURL     = "https://%s/api/version"
+	uptimeURL      = "https://%s/api/uptime"
 	firmwareURL    = "https://%s/api/updatefirmware"
 	certificateURL = "https://%s/api/installcertificate"
 	licenseURL     = "https://%s/api/option/load"
@@ -908,3 +914,24 @@ func (a *API) PowerSupplyStatus() (*PowerSupplyStatus, error) {
 
 	return p, nil
 }
+
+// FetchUptime returns uptime of the device
+func (a *API) FetchUptime() (*Uptime, error) {
+	url := fmt.Sprintf(uptimeURL, a.source)
+	resp, err := a.Client.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, errors.New(http.StatusText(resp.StatusCode))
+	}
+
+	u := &Uptime{}
+	if err = json.NewDecoder(resp.Body).Decode(u); err != nil {
+		return nil, err
+	}
+
+	return u, nil
+}

calnex/api/api_test.go

@@ -835,3 +835,24 @@ func TestPowerSupplyStatusSentinel(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, expected, g)
 }
+
+func TestFetchUptime(t *testing.T) {
+	sampleResp := "{\"uptime\": 42}"
+	expected := &Uptime{
+		Uptime: 42,
+	}
+
+	ts := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter,
+		r *http.Request) {
+		fmt.Fprintln(w, sampleResp)
+	}))
+	defer ts.Close()
+
+	parsed, _ := url.Parse(ts.URL)
+	calnexAPI := NewAPI(parsed.Host, true, time.Second)
+	calnexAPI.Client = ts.Client()
+
+	f, err := calnexAPI.FetchUptime()
+	require.NoError(t, err)
+	require.Equal(t, expected, f)
+}